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GearRatio's Comments

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Now There's A 3D-Printed Gun Made Out Of Metal, And We're Doomed

Now There's A 3D-Printed Gun Made Out Of Metal, And We're Doomed

Commented Nov 8, 2013 at 16:08:39 in Technology

“Points up a real problem: barrel of a firearm really wants to be made of hardened steel. "As cast" metal is a poor second best; plastic is OK for a single shot "scare all the liberals" toy gun, but not much more.

Gotta believe that the SLA pistols that have been posted on the Web recently are likely to be more dangerous to their wielders than to their targets. Think there's a good reason that all the videos of these gadgets show them being fired using a lanyard tied to their triggers!”
Now There's A 3D-Printed Gun Made Out Of Metal, And We're Doomed

Now There's A 3D-Printed Gun Made Out Of Metal, And We're Doomed

Commented Nov 8, 2013 at 13:34:28 in Technology

“Well, if a DMLS machine isn't in your budget, can always use investment casting to make metal parts via 3D printing. Just make a (slightly outsized) plastic part with a 3D printer, pack it in clay, fire it into bisque (evaporating the plastic), and, voila, you have a 3D female mold, ready to pour molten metal into. The fired ceramic makes a "one shot" mold; you have to destroy the mold to release the cast part. But, does work. Jewelers have been making cast parts this way since Egyptian times.

Easier to do with low melting point alloys like brass, pewter, gold, or silver, but, can be used for steel, if you have access to a furnace that will melt steel...”

Robert Williams2 on Nov 8, 2013 at 14:34:46

“In fact, many early cannons were mad using this process, by bell makers.
And, well, they exploded quite regularly.”

Croaxleigh on Nov 8, 2013 at 14:18:57

“Not all plastics are created equal, though. PLA is preferable to ABS or other types of plastic for this sort of thing, since it melts easily without releasing potentially dangerous vapors. It works essentially like lost wax casting, except the PLA melts out instead of the wax.”
Olivier Feuillette Turns Kayak Into Human-Powered Submarine (VIDEO)

Olivier Feuillette Turns Kayak Into Human-Powered Submarine (VIDEO)

Commented Oct 25, 2013 at 15:59:59 in Green

“An off the charts "coolness" factor, but... think I would stick with mask, fins, and aqualung.”

ducky of earl on Oct 26, 2013 at 20:48:52

“Totally off topic but every time I hear aqualung I automatically think Jethro Tull. :)”
Charles River, Boston's Famously Filthy Waterway, Hosts Community Swim

Charles River, Boston's Famously Filthy Waterway, Hosts Community Swim

Commented Jul 16, 2013 at 08:34:30 in Green

“Did get dunked in the Charles River once, circa 1970, whilst learning to sail. Kinda smelly, but, didn't take any harm.

Biggest problem the river had back then, maybe still, is that the bottom of the basin is full of salt water, tidal back flow from Boston Harbor. The salt water is denser than the fresh water above it, so, the basin remains stratified.

Without any vertical circulation, the salt water at the bottom of the basin has become anaerobic, and supports a good sized population of anaerobic microbes, which produce stinky "marsh gas" by the thousands of cubic meters. A disincentive to swimming...”
Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Commented Jun 26, 2013 at 08:06:47 in Science

“Quite correct. My bad, being sloppy on units (or lack thereof)...”
Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Commented Jun 25, 2013 at 16:54:28 in Science

“Ah, my apologies for overreacting!

Seriously, though, make my living as an engineer, and, as they say, everything is made out of stuff. So, behooves one to know the properties of "stuff."”

shindogdiggity88 on Jun 25, 2013 at 17:33:37

“Engineer huh? Nice :)

I do suppose you would need to know a thing or two about the elements if you're to work as a engineer.”
Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Minnesota Meteorite: Farmer Bruce Lilienthal Finds Ancient Space Rock Half-Buried In Field (VIDEO)

Commented Jun 25, 2013 at 16:44:57 in Science

“Well, specific gravity of country rocks averages ~ 2.5-3.0 tonnes / m^3; iron runs ~ 7.8. Not a particularly subtle difference...”

ibn riptoff on Jun 25, 2013 at 18:44:49

“Well, if you want to get technical, the density would be ~ 2.5 -3.0 tonnes / m^3. The specific gravity would be simply ~2.5 - 3.0.”

shindogdiggity88 on Jun 25, 2013 at 16:50:10

“It was a joke.

Secondly, are you some sort of geologist? Because if you're not, then how often do you really use that kind of information out in the real world?”
Sherwin Smith, Tennessee Official, Says Water Quality Complaints Could Be 'Act Of Terrorism' (AUDIO)

Sherwin Smith, Tennessee Official, Says Water Quality Complaints Could Be 'Act Of Terrorism' (AUDIO)

Commented Jun 25, 2013 at 07:47:39 in Green

“Well, let's see. A regional elected official in Tennessee. Ya, he coulda voted for Obama... or Porky Pig, or Luke Skywalker, or...

Tell ya, though, wouldn't bet donuts on it, and certainly wouldn't bet dollars; you need to save your pennies so you can move outa Mom's basement, someday...”
Diseases Named After Scientists & Doctors: 26 Illnesses And How They Got Their Monikers (PHOTOS)

Diseases Named After Scientists & Doctors: 26 Illnesses And How They Got Their Monikers (PHOTOS)

Commented Jun 13, 2013 at 17:13:06 in Science

“Not to mention Boerhaave's Syndrome, rupture of the esophagus. Quite painful (trust me on this) and, without immediate surgery, 100% fatal.

Sad to say, even with immediate surgery, ~ 20% fatal...”
Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Commented Apr 24, 2013 at 08:08:13 in Politics

“Can you vote a Corporation out of office?”
Stella Tremblay, New Hampshire Legislator, Says U.S. Government Planned Boston Bombing

Stella Tremblay, New Hampshire Legislator, Says U.S. Government Planned Boston Bombing

Commented Apr 23, 2013 at 19:25:58 in Politics

“NH House of Representatives has at least one member form every town and village in the State; some towns with as few as a half dozen or so voters send Reps to Concord. As a result, NH House is the 3rd largest legislative body in the world, and has a fair number of true "zoo specimens" in its ranks.

Also, should note that there are a few (small) towns in NH whose politics are dominated by local "splinter" religious and political groups. Perhaps no accident that the Libertarians decided a few years back that NH was their best best to establish a Randite, Laissez Faire paradise hefre in th US.”
Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Commented Apr 23, 2013 at 19:12:42 in Politics

“Well, beats just calling in the Corporate Legal Department to stonewall, deny everything, and use the (Government's) Courts to delay justice 'till the claimants are all either broke or dead...”

Strings55 on Apr 23, 2013 at 20:56:59

“No it doesn't. You at least have a court system and the rule of law to take a company to court. 

Can you take the government to court?”
Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Charges Against Paul Kevin Curtis In Ricin Case Dismissed

Commented Apr 23, 2013 at 18:57:55 in Politics

“Well, give them this: the Feds were willing to come clean when it became apparent that they had made a mistake. Not a trait that the John Galts of the world are noted for...”

Strings55 on Apr 23, 2013 at 19:07:51

“So admitting they've made a mistake AFTER everything's been screwed up...like healthcare insurance, the economy, and all the rest is somehow not much comfort...”
Seven-Sexed Microbe, Tetrahymena, Spotlighted In New Research

Seven-Sexed Microbe, Tetrahymena, Spotlighted In New Research

Commented Mar 29, 2013 at 09:58:28 in Science

“Not sure whether they can mate, but, appears that "same sex" matings would be infertile, without issue. Not so different from our own species, in that respect...”
Seven-Sexed Microbe, Tetrahymena, Spotlighted In New Research

Seven-Sexed Microbe, Tetrahymena, Spotlighted In New Research

Commented Mar 27, 2013 at 16:58:10 in Science

“Very interesting. Had once concluded that having more than 2 sexes was maladaptive on mathematical grounds. Argument is that a pair of individuals from a 2 sex species meeting each other have a 1/2 chance of being able to breed. 3 individuals from a 3 sex species meeting each other have only a 6/27 chance of being a breeding trio. Probability of successful mating 2X worse than that for 2 sex species, and the odds get worse as the number of sexes goes up.

Appears that pairs of this particular 7 sex micro-organism can mate as long as the two individuals are not the same sex. Probability of successful mating would then be 42/49, better than that of 2 sex species...”

NotAfraidmm on Mar 28, 2013 at 15:38:34

“so no same sex mating is allowed with a "7 sexed" organism?

"Because the mating type gene helps Tetrahymena recognize others of a different sex, the researchers say that the finding could shed light on how other cells, including those in humans, recognize those that are different from themselves."”

Welease Wodewick on Mar 28, 2013 at 05:44:04

“I agree.

I think!!!

VP :-)”
How Natural Gas Pipelines Could Boost Hydrogen

How Natural Gas Pipelines Could Boost Hydrogen

Commented Mar 27, 2013 at 12:45:28 in Green

“Needs to be done carefully; steel is prone to failure when exposed to hydrogen under pressure. This was discovered early in the last century, when the Faber Werks in Germany was developing the Haber-Bosch process for producing artificial nitrates. The pressure vessel in a Haber-Bosch plant carries nitrogen and hydrogen, at high temperature and pressure (~ 200 bar, ~ 500C); several of the early pressure chamber designs failed catastrophically...”
Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Commented Feb 15, 2013 at 14:37:52 in Politics

“BS. "What is allowed" is neither a subset nor a superset of "What did you do." Try drawing a Venn diagram...”

jhnnxn on Feb 15, 2013 at 18:02:37

“You assume that they do things that they're not allowed to do. If that was the case your math would be correct. However they're not breaking laws, they're getting laws made to order. Huge difference, therefore you fail math today.”
Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Commented Feb 15, 2013 at 08:41:23 in Politics

“Your example is one of categories, and how they do and don't overlap: set of all squares is a (proper) subset of the set of all rectangles. Not applicable: neither Warren's actual question or the one than Curry answered belong to categories that overlap much at all; they are largely disjoint. Which, of course, is why Curry chose to answer a different question than the one actually asked.

Equivalent would be a child, replying to Mom's query as to whether he raided the cookie jar, saying "I don't really like Oreos..."”

jhnnxn on Feb 15, 2013 at 08:50:57

“Wrong. The answer to her question was logically a subset contained within the her reply. Her ignorance,or for that matter yours, in seeing this doesn't change it.”
Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Elizabeth Warren Embarrasses Hapless Bank Regulators At First Hearing (VIDEO)

Commented Feb 15, 2013 at 08:07:25 in Politics

“Let's see if I can explain this to you so that you can understand:

Liz asked the question: "When did you last prosecute anyone?"

Curry answered a different question: "Are you legally required to prosecute anyone?"

There, isn't that simpler?”

jhnnxn on Feb 15, 2013 at 08:14:53

“I can understand your desire for simplicity for all. Equal footing and all. Let me give you something to ponder. Every square is a rectangle, but not every rectangle is a square. Apply that to the situation at hand and get back to me.”
Steubenville High School Students Joke About Rape In Video Leaked By Anonymous

Steubenville High School Students Joke About Rape In Video Leaked By Anonymous

Commented Jan 3, 2013 at 08:38:55 in Crime

“Sad to say, there are such games. Saw one, years back, titled, IIRC, "Custer's Revenge". Featured an animated soldier, dressed in "Union" blues, pursuing and raping Indian women. Sick, sick stuff...”
Paul Krugman: Republicans To Throw 'One Long Tantrum'

Paul Krugman: Republicans To Throw 'One Long Tantrum'

Commented Dec 6, 2012 at 17:41:28 in Business

“Well, admire your sense of humor, anyhow.

Seriously, though, if the GOP can place the likes of Aiken and Broune... on the House Committee on Space, Science, and Technology(?!?!?), can you blame me if I find it comical that a self described conservative can use the term "crackpot" to describe Democrats?”

Philclock on Dec 6, 2012 at 18:54:17

“Obama? Reid? Pelosi? Kucinic? Franklin? Waters? Kerry, potential Secretary of State?

Nah, clearly Dems are the masters of theater of the absurd, let alone comedy.”
Evolution Of Intelligence Tied To Duplicate Genes In Ancient Sea Worm, Pikaia Gracilens

Evolution Of Intelligence Tied To Duplicate Genes In Ancient Sea Worm, Pikaia Gracilens

Commented Dec 4, 2012 at 21:48:41 in Science

“I suspect that there has been a bit of a leap to reach the conclusion that the particular vertebrate animal, Pikaia (of Burgess Shale fame), was the exact organism that hosted this genetic change. Comparative genetics would readily allow an approximate dating of when the glutamate gene was duplicated in the vertebrate genome, and, at 550 MYA, Pikaia is one of the few known vertebrate organisms from the fossil record. Still, duplication could as readily have occurred in one of the Conodont critters that were roughly contemporous with Pikaia, or, could have occurred in a primitive vertebrate of which we have no fossil record.

Needles to say, the Burgess Shale fossils of Pikaia did not preserve the animal's DNA...”

ythri on Dec 6, 2012 at 14:28:35

“I don't think it's helpful when they point to a specific fossil animal and say that is was the one where a genetic event occurred. They should just say it was an animal like Pikaia, from the same time period.”
Paul Krugman: Republicans To Throw 'One Long Tantrum'

Paul Krugman: Republicans To Throw 'One Long Tantrum'

Commented Dec 4, 2012 at 13:32:00 in Business

“Good luck with that.

Seriously, after the clown car posse that posed as serious contenders for the GOP presidential nomination this time around? Sad to say, Willard really WAS the best you could do!”

Philclock on Dec 6, 2012 at 16:59:59

“Nope, Ryan, Rubio, Jindal, even Jeb Bush would've been a heckuvalot better than good man but tassle-loafered Mitt.”
Paul Krugman: Republicans To Throw 'One Long Tantrum'

Paul Krugman: Republicans To Throw 'One Long Tantrum'

Commented Dec 3, 2012 at 12:38:30 in Business

“Goodness! A conservative grousing about abuse of power, K street cronies, crackpot theories?!? Don't do "irony" much, do you?”

Philclock on Dec 3, 2012 at 13:35:22

“Hey, Repubs have their problems, we gotta contend with RINO's unless we get lucky with another Ronnie, hope to find him next time around, if so YOU people are TOAST!”
Human Intelligence Declining, Controversial New Study Suggests

Human Intelligence Declining, Controversial New Study Suggests

Commented Nov 13, 2012 at 15:15:16 in Science

“One major reason that modern thinkers have "giant's shoulders" to stand on... is that our modern society is literate. A paleolithic inventor who discovered a more elegant way to snare rabbits would have had only indifferent success in having his new idea promulgated, even to the next generation of his or her own tribe.

With the invention of writing, ideas could spread further and faster. Notably, the scientific and technical revolution that continues to fuel our own civilization really began in earnest with Gutenburg's printing press, which allowed for even faster and more widespread dissemination of knowledge.

Gutenburg + 200 years = Newton...”
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